Thermo Fisher Scientific CyberScan DO 300 - Manual (Page 11)

Instruction Manual DO 300
8
4.3 Dissolved Oxygen Calibration in % Saturation
You can calibrate this meter quickly and easily in air. The exact calibration value depends on
barometric pressure. The meter is set to a factory default of 760 mm Hg, which results in a
calibration value of 100% saturation in air.
NOTE: If the barometric pressure setting has been changed from
760 mm Hg, the calibration value in air will automatically adjust
to a value other than 100%. The adjusted value will be correct for
the new barometric pressure setting.
See page 21 to change the pressure setting. See Pressure vs
Altitude Table on page 50 for a table of adjusted % saturation
values.
To calibrate 100% Saturation:
1. Press MODE key to select % Saturation mode.
2. Rinse the probe well with deionised rinse water. For best
accuracy, wipe the end of the probe dry. Do not touch the
membrane.
3. Hold the probe in the air with the sensor facing down and
press CAL key to calibrate the meter. The LCD will show a
“CAL” mode. The primary display will show the current value
of measurement and the secondary display will show “100.0”
to which the meter is going to be calibrated. Wait for the
reading to stabilise.
4. Press ENTER key to confirm the calibration. The meter
automatically calibrates to 100% air saturation and returns to
the measurement mode.
NOTES:
Whenever an error occurs during calibration, the ERR indicator
appears in the lower left hand corner of the display.
You can offset your % DO calibration. See section 8.4 - OFS:
Offset for % Saturation Measurement on page 24 for directions.
Figure 6: To calibrate for
100% saturation